layout/tag: Add client_focus(NULL) in uicb_tag and remove it of arrange()

src/layout.c

@@ -51,7 +51,6 @@ arrange(void)
           }
 
      tags[selscreen][seltag[selscreen]].layout.func();
-     client_focus(NULL);
      infobar_draw(selscreen);
 
      return;

src/tag.c

@@ -73,6 +73,7 @@ uicb_tag(uicb_t cmd)
      }
 
      arrange();
+     client_focus(NULL);
 
      return;
 }